17
©
Dinel, s.r.o. PDU–4xx–W
For more details on relay functions see section 8.4 Control of relay outputs.
In the measuring mode, the user can check and change the main threshold values used to switch
the relay. When the button
“[
^
]”
or
“[
v
]”
is pushed, the display toggles among
”rEL1”
to
”rEL4”
and their actual set values. If free access is allowed (see menu
”SECu”
), the user can change the
threshold values by pressing the
[ENTER]
button.
The process is the same as when editing the menu.
Fig. 11: Single-threshold control of relay outputs
and LED R1-R4 indicators
Fig. 12: Two-threshold control of relay outputs
and LED R1-R4 indicators
Example of setting the relay output for single-threshold control:
(It is assumed that the measuring range of the PDU unit is set to range 0....100, i.e. 4 mA corre-
sponds to 0.0 % and 20 mA corresponds to 100.0%)
The requirement is to activate the relay if the displayed value exceeds 75.0% and to deactivate the
relay when the displayed value drops below 25.0%.
Setting the parameters:
modE
= on,
SetP
= 50,
HYSt
= 25
Example of setting the relay output for two-threshold control:
(It is assumed that the measuring range of the PDU unit is set to range 15....65, i.e. 4 mA corre-
sponds to 15.00 hl and 20 mA corresponds to 65.00 hl)
The requirement is to activate the relay if the displayed value is less than 20.00 hl and to activate
the relay when the displayed value is greater than 60.00 hl.
Parameter setting:
modE
= out,
SetP
= 20.50,
Set2
= 59.50,
HYSt
= 0.5
Note: A different hysteresis value can be set, provided that SetP - HYSt = 20
and Set2 + HYSt = 60.
"SEtP" parameter
measurement
"HYSt" parameter
zone B
zone A
